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December 31, 1963 Mr. 0. A. Jones Captain of Police Forgery Bureau Subject: William McEwan Duff Polygraph Examination Sir: A polygraph examination was given to William McEwan Duff upon the request of Lieutenant Cunningham to determine if he had any guilty knowledge about the shooting at General Edwin Walker. This test was conducted at 8:00 P.M. on June 12, 1963. Below is a list of pertinent questions asked. 1. Do you have a grudge with General Walker? Answer: No 2. Did you shoot at General Walker? Answer: No 3. Do you remember who you were with the night General Walker was shot at? Answer: No 4. Have you given information to anyone about the activity of General Walker or the layout of the house except the two men from Oklahoma? Answer: No 5. Have you owned or had in your possession a high powered rifle since you have been in Dallas? Answer: No 5. Do you know who shot at General Walker? Answer: No Lieutenant Cunningham set this appointment up and was the investigating officer. This officer had left a set of questions for Lieutenant Potts to bring with Mr. Duff to be examined. Lieutenant Potts was not familar with this case. Lieutenant Potts was advised there was a definite language barrier between Mr. Duff and the examiner because Mr. Duff was an immigrant. Taking everything in consideration, it was the opinion of this examiner, that Mr. Duff was truthful on all the above questions except question number three. Due to a lasp of time between the offense and examination, this person seemed puzzled over this question which could have caused the indication of deception. Due to the fact this person answered the other questions with the truth, it is believed Mr. Duff was confused rather than lying. Respectfully submitted, K.histories R. D. Lewis Detective of Police Identification Bureau RDL/mel 10